钛酰草酸络合物热解制备微细TiO_2过程中的形态变化

本文研究了用精制ＴｉＣｌ４、草酸和氨水合成钛酰草酸络合物及其热解制备微细ＴｉＯ２的过程．重点考察了草酸用量、煅烧分解时间对络合物粒子和微细ＴｉＯ２粒子形态的影响．研究结果表明，用钛酰草酸络合物作为前驱体在８５０℃下热两小时．可以制得分散性较好，粒子尺寸分布较均匀的金红石结构ＴｉＯ２微细粒子；热解时间对ＴｉＯ２粒子的形态有较大影响；草酸用量增加可导致络合物粒子的大量团聚，但对热解产物金红石结构的ＴｉＯ２粒子的形态影响很小．

Morphological Change of micro fine TiO_2 and Its Precursor during Synthesis and Decomposition of Titanyl-oxalato Compounds

This paper studies the preparation of microfine TiO2 particles by the synthesis and decomposition of titanyl-oxalato compounds using refined TiCl4,H2C2O4 and aqueous ammonia as raw materials. The results show that well-dispersed,narrow size distribution and microfine TiO2 powder can be obtained by the decomposition of titany-oxalato compounds;the morphology of microfine TiO2 particles is controlled mainly by thermal decomposition time;the excessive oxalic acid used can result in the agglomeration of titanyl-oxalato compounds.but which has almost no effect on the morphology of microfine TiO2.